Examine source code of Flagium

{
  "manifest_version": 3,
  "name": "Flagium",
  "version": "1.0.3",
  "description": "Shows the country flag of the current website's server",
  "permissions": [
    "activeTab",
    "storage",
    "webRequest"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "service_worker": "background.js",
    "type": "module"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "flagium@proside.pp.ua",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}